跳跳舞舞 Hopping and Dancing With Joy
復至園中，又思量道：「等打了來救。」如此者兩三番，卻才跳跳舞舞的到園裡。長老見了，悲中作喜道：「猴兒，想是看見我不曾傷命，所以歡喜得沒是處，故這等作跳舞也？」复至园中，又思量道：「等打了来救。」如此者两三番，却才跳跳舞舞的到园里。长老见了，悲中作喜道：「猴儿，想是看见我不曾伤命，所以欢喜得没是处，故这等作跳舞也？」
逐句解 Line by line
Back to the garden, and he thought again: "Better strike first and then come and rescue."
Thirteen characters, and he has reversed himself again. 思量, to turn something over, takes 量 as liáng — the weighing-and-measuring reading rather than the capacity one it takes in a compound like broad-minded.
Two or three times over he went like this, and then at last came into the garden hopping and dancing.
跳跳舞舞 doubles both characters of hop-and-dance, which in the vernacular means capering about. What the master sees is a monkey arriving in a state of high excitement; what has actually happened is that Wukong has changed his mind three times and given up on deciding.
The elder saw him and turned from grief to gladness, saying, "Monkey! I suppose you have seen that my life is not harmed, and that is why you are so happy you do not know what to do with yourself, and are capering about like this?"
悲中作喜 is to make gladness out of the middle of grief. The master's reading of the situation is entirely wrong and entirely loving. In 歡喜得沒是處, so happy there is nowhere to put it, 得 is de; 曾 is céng in the not-yet phrase; and 沒是處 is a lovely idiom for having no idea what to do with a feeling.
Tripitaka sees his disciple dancing and concludes that the dancing is for joy at finding him alive. It is a completely mistaken reading of a man in the grip of indecision, and it is also the kindest thing anybody says in the chapter.
The novel does not correct him. Wukong does not explain that he has been running between two rooms unable to choose. He walks up and unties the ropes, and lets his teacher keep the better version.